William is the second son of Thomas Cavendish, clerk of the pipe, and Alice, daughter of John Smith of Padbrook Hall. He married three times, and only had three surviving sons ... all by his third wife, Bess of Hardwick.
m.1. Margaret "Anne" Bostock (d. 9 June 1540; bur. Jun 1540 St. Botolph's, Aldergate). Issue: 1 son; 4 dau.
↑ Duke of Devonshire (1790), calls first wife "Anne," dau. of Edward Bostock, (p. 51)
↑ Wilson, G. (1851). The life of the Hon. Henry Cavendish, pp. 5. Google Books.
↑Collins (1756), confuses the first and second wives. This is evident not only by the fact that he calls Elizabeth Parker, "Margaret" ... but because he attributes the first wife's TOMB to the second. The give away is the burial date: Margaret Bostock was buried in June 1540, when Elizabeth Parker was still alive!
↑ Henry Baynton, (Lewis, n.d.
.... clerk to Cromwell by 1532; auditor and receiver for monastic lands by 3 Dec. 1533; commr. tenths of spiritualities, Herts. 1535, for monastic lands in Ireland 16 Aug 1540-2; auditor, ct. of augmentations 24 Apr 1536-46; j.p. liberty of St. Albans 1540, Herts. 1547, Herts. and Derbys. 1554; treasurer, the chamber 19 Feb. 1546-57, and ct. of gen. surveyors 19 Feb 1546-2 Jan 1547; sewer by 1547; steward for William, Lord Paget, unknown property.
Lundy (2009), citing email from Robin J Conisbee Wood, also asserts that Coningby is the mother of Susan (b. 31 Oct 1543); Joan Cavendish (b. 5 Feb 1544/45); and Frances (b. 1546, d. c 1546).better
Jewitt, L.F.W. (1874), also names Elizabeth Coningsby as the second wife of William Cavendish, but he calls her the dau. of Sir Thomas Conyngsby and widow of William Paris, (p. 121).
↑ Brodhurst, (1902), reprints the entry in Cavendish' pocketbook at Welbeck, which states that he married Elizabeth, dau. of Thomas Parker of Postingford, Suffolk, at Black Fryars in London the day after All Souls Day in 34 Hen. VIII , (p. 90). Brodhurst (1902), goes on to state that Elizabeth Parker died in 1545, and that her "three children died young."
↑ Duke of Devonshire (1790), calls 2nd wife Margaret dau. of Thomas Parker of Poslingford, Suffolk, and states that she had no issue, (p. 52).
Lundy, D. (2009, November 23). "William Cavendish #407404, b. circa 1504, d. 15 Oct 1557." The Peerage. Web.CAUTION
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There is much speculation as to the second wife of Sir William Cavendish. Shown in this profile as the current preferred Wife - Elizabeth Parker, this is backed up by the “Journal of the Derbyshire Archaeological and Natural History Society (1879-1960)” published by the Derbyshire Archaeological and Natural History Society, (46 volumes. London: Bemrose, 1879-1960), FHL book 942.51 B2a., vol. 29 p. 90. which contains the following very significant information:
In Sir William Cavendish's pocket book at Welbeck there is this entry:--
Md. that I was marryed unto Elizabeth my Wife, Daughter of Thomas Parker of Postingford in Suffolk, Esq., at the Black Fryars in London, the Morrowe after All Souls Daie, Anno 34, R.H. 8 (1543).(2nd Nov 1543) His Wife died 1545; her three children died young.
The Assistant Curator Dr Sophie Littlewood, at Wellbeck says in August 2017:-
We do indeed have a pocketbook written by Sir William Cavendish in the archives at Welbeck. I can confirm that it lists his marriage to Elizabeth at Black Friars, London on 3 November Anno 34 (1543). However, rather frustratingly, there is no surname mentioned and nor does this entry state that Elizabeth was the daughter of Thomas Parker of Postingford in Suffolk (as quoted in the Journal of the Derbyshire Archaeological and Natural History Society).
In the pocketbook, the children of Cavendish’s second marriage (to Elizabeth) are listed as Susan, Johan and an unnamed baby girl who died presumably shortly after birth.
The Blackfriar registers for the period in questin have been lost through time as indicated by the London Records Office.
In The publication Magna Charta Ancestry by Richardson there is on page 363 the following entry which appears now to have been derived from Collins and states that Genealogst n.s. 7 (1890): 66-67 (Derbyshire Reds.. 1569 & 1611) (Ca/endish ped.:-
‘William Cavendish. Treasurer of the Chamber to H. 8. Ed. 6. and Queen Mary.  = Margaret, da of... Bostokof co. Chester. 1 ux.. mar. 2ux. Elizabeth, da of... Conisby.  = Elizbeth.da of John Hadwickof Hadwick.
Thus repeating the misinformation on the second wife.
Blackfriars was an extra parochial liberty in the north west of the borough of Leicester and was originally the site of a Dominican Friary. We hold no surviving records relating to the friary.
I have checked the index to John Nicholl’s extensive ‘History and Antiquities of Leicestershire’ published c1800 but could find no entry for any marriage of William Cavendish or either an Elizabeth Coningsby or Parker. As our marriage registers have recently been digitised and indexed on the family history website Findmypast , I also checked there to see if there was any reference to the marriage of William Cavendish but without any success.
That implies that the date of death shown on Mr. Paris' profile is wrong... I think his relatives are advocating for a later date of death (seems to be a dispute or maybe it's just unsourced gedcom but the relatives are active).
According to the biography of Bess of Hardwick by Mary S. Lovell, page. 44, William's second wife, was "Elizabeth Parris (formerly Conningsby, nee Parker)" which would indicate Elizabeth Parker was married 3 times, first to Mr Conningsby, second to Mr Parris, and thirdly to William Cavendish.
Robinson (1873), published a pedigree from Hampton Court with additions by George Coningsby, DD... which states that Elizabeth Coningby married twice: first to William Paris, and then William Cavendish, sec. of Card. Wolsey / father of 1st Earl of Devonshire. Stirnet seems to have published the same thing (see screenshot).
I see another reference to Elizabeth's alleged marriage to William Cavendish in "The World of Fashion and Continental Feuilletons," (1824).
Just to add grist to the mill the DNB for William on Wikisource says that his second wife was called Margaret (NOT Elizabeth)see below extract:-
"Sir William married, first, Anne, daughter of Edward Bostock of Cheshire, by whom he had a son, who died young, and four daughters, two of whom died in infancy; secondly, Margaret (d. 16 June 1540), daughter of Thomas Parker of Poalingford, Suffolk, by whom there was no issue"